B - Operations – Transporting – 01 – J
Patent
B - Operations, Transporting
01
J
B01J 35/02 (2006.01) B01D 53/92 (2006.01) B01D 53/94 (2006.01) B01J 23/56 (2006.01) B01J 23/63 (2006.01) B01J 23/89 (2006.01) B01J 35/00 (2006.01) B01J 37/02 (2006.01)
Patent
CA 2165054
The present invention relates to a layered catalyst composite of the type generally referred to as a three-way conversion catalyst having the capability of substantially simultaneously catalyzing the oxidation of hydrocarbons and carbon monoxide and the reduction of nitrogen oxides. The structure of the layered catalyst composite of the present invention is designed wherein there is a first layer and a second layer. The first layer comprises a first support; at least one first palladium component and an oxygen storage component in intimate contact with the palladium component; optionally another first platinum group metal component, a zirconium component; at least one first alkaline earth metal components and at least one first rare earth metal component selected from the group consisting of lanthanum metal components and neodymium metal components. The second layer comprises a second support; at least one second palladium component; optionally another second platinum group metal component; at least one second alkaline earth metal component; at least one second rare earth component selected from the group consisting of lanthanum metal components and neodymium metal components and a zirconium component.
L'invention porte sur un catalyseur composite en couches du modèle généralement dit "catalyseur à conversion triple" capable de catalyser presque simultanément l'oxydation des hydrocarbures et du monoxyde de carbone, et la réduction des oxydes d'azote. La structure du catalyseur composite comporte deux couches. La première couche comprend un premier support, au moins un premier élément de palladium et une réserve d'oxygène en contact étroit avec ce dernier, éventuellement un premier élément d'un platinide, un élément de zirconium, au moins un premier élément d'un métal alcalino-terreux et au moins un premier élément d'un lanthanide choisi parmi le lanthane et le néodyme. La seconde couche comprend un second support, au moins un second élément de palladium, éventuellement un second élément d'un platinide, au moins un second élément d'un métal alcalino-terreux, au moins un second élément d'un lanthanide choisi parmi le lanthane, le néodyme et le zirconium.
Dettling Joseph C.
Hu Zhicheng
Lui Yiu-Kwan
Wan Chung-Zong
Sim & Mcburney
The Engelhard Corporation
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